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    Apter Power delivers completely calibration-verified, out-of-production sensory components to stabilize your critical bearing-vibration topologies and insulate your rotational machinery from catastrophic NOT OK faults and signal-routing drifts.

330876-02-50-01-00

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The Bently Nevada 330876-02-50-01-00 is a heavy-duty, high-precision 50 mm eddy current proximity probe designed for long-range displacement monitoring in critical rotating machinery.
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Technical specifications for 330876-02-50-01-00

  • Manufacturer:
    Bently Nevada
  • Part Number:
    330876-02-50-01-00
  • Product Type:
    Proximity Probe
  • Stock:
    1
  • Probe Case Type:
    M14x1.5 Thread
  • Total Length:
    5.0 meters (16.4 feet)
  • ArmorOption:
    High Temperature FluidLoc Cable with Armor
  • Agency Approval:
    No Approvals
  • Total Linear Range:
    27.9 mm (1100 mils)
  • Extended Range Limits:
    1.3 mm to 29.2 mm (50 mils to 1150 mils) away from target face
  • Nominal Scale Factor:
    394 mV/mm (10 V/in or 10 mV/mil) when properly matched
  • Operating Temperature Range:
    -51°C to +200°C (-60°F to +392°F) continuous
  • Short-Term Peak Temperature:
    Up to +250°C (+482°F) for less than 24 hours
  • Recommended Target Size:
    Minimum 102 mm (4.0 inches) diameter flat metal surface
  • Probe Tip / Case Material:
    Polyphenylene Sulfide (PPS) / AISI 304 Stainless Steel (SST)
  • Weight:
    0.6 kg
  • Estimated shipping dimensions:
    24x24x6.2cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Applications Monitoring & Control Safety & Compliance

Features:

  • Extended 27.9 mm (1100 mil) Linear Measurement Range
  • Hermetically Sealed FluidLoc Cable with Stainless Steel Armor
  • Streamlined Installation via ClickLoc Connectors and Removable Collar
The Bently Nevada 330876-02-50-01-00 boasts the longest linear measurement capability in the eddy current product lineup, making it uniquely qualified to monitor large-scale axial movements and differential thermal growth in utility-scale steam turbines.

Equipped with a dual-sealed case and a specialized high-temperature FluidLoc cable, the Bently Nevada 330876-02-50-01-00 completely blocks the ingress of corrosive process fluids, high-velocity steam, and hot oil, while the flexible steel armor provides rugged mechanical defense.

The specialized coaxial connectors on the Bently Nevada 330876-02-50-01-00 feature gold-plated interfaces for low resistance, complemented by a removable collar that drastically reduces the outer diameter of the connector to facilitate seamless routing through complex machine conduits.

The 330876-02-50-01-00 Bently Nevada 3300 XL 50 mm Proximity Probe may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Bently Nevada 330876-02-50-01-00 3300 XL 50 mm Proximity Probe Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Bently Nevada 330876-02-50-01-00 3300 XL 50 mm Proximity Probe

General

  • Manufacturer GE / Bently Nevada
  • Model 330876-02-50-01-00
  • Condition New Original ready stock
  • Product Family 330876-02-50-01-05,330876-02-50-01-CN,138492-01
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Differential and Rotor Expansion Monitoring:The primary and most critical application of the Bently Nevada 330876-02-50-01-00 is tracking Differential Expansion (DE) and Rotor Expansion (RX) in utility-scale steam turbine generators. As these massive turbines experience extreme thermal changes during startup and shutdown, the rotor grows axially at a different rate than the stator casing; this probe monitors that exact clearance to prevent catastrophic axial collisions.
  • Large-Scale Power Generation Assets:This specific probe is widely deployed across thermal, nuclear, and combined-cycle power plants. Due to its extended linear range, it is uniquely qualified to protect heavy-duty rotating machinery, such as large gas turbines and high-capacity generators, where traditional 8 mm or 11 mm probes lack the necessary measurement depth.
  • Critical Petrochemical & Refining Equipment:In heavy oil and gas processing facilities, the Bently Nevada 330876-02-50-01-00 is utilized on ultra-large multi-stage industrial compressors, high-pressure water injection pumps, and critical process expanders. It ensures that massive shaft movements under fluctuating process loads remain safely bounded.
  • Severe Industrial Infrastructure Environments:Beyond power and petrochemicals, this robust probe is deployed on large-scale industrial machinery, such as massive blast furnace blowers in steel mills and large wastewater treatment aerators. Its physical resilience allows it to provide stable data even when subjected to ambient vibration and harsh physical dust.
  • Seamless Integration with Bently Nevada Machinery Protection Systems:The raw analog signals from the Bently Nevada 330876-02-50-01-00 route seamlessly through its companion 50 mm Proximitor Sensor into industry-standard monitoring racks, such as the Bently Nevada 3500/45 Position Monitor or the Orbit 60 platform. This creates a direct, hardware-level machinery protection loop.
  • High-Stability Signal Conditioning for Control Systems:With a nominal scale factor of 394 mV/mm (10 V/in), the probe system translates minute mechanical movements into highly stable voltage outputs. This precise analog signal can be easily mapped into Distributed Control Systems (DCS), Programmable Logic Controllers (PLCs), or SCADA systems for continuous trend visualization.
  • Real-Time Trend Logging & Predictive Maintenance Data:When integrated into plant asset management software like Bently Nevada System 1, the data generated by the Bently Nevada 330876-02-50-01-00 enables advanced predictive analytics. Reliability teams can monitor long-term axial displacement trends to plan maintenance overhauls based on actual wear rather than arbitrary time intervals.
  • Hardware-Level Diagnostic Depth & False-Trip Mitigation:The monitoring loop constantly evaluates the DC bias voltage of the connected Bently Nevada 330876-02-50-01-00. If a field cable is severed, shorted, or disconnected, the internal system immediately detects that the voltage has breached "Not OK" limits, triggering an instrumentation fault alert rather than a false machinery shutdown trip.
  • Strict Alignment with API 670 Standards:The fundamental engineering behind the Bently Nevada 330876-02-50-01-00 conforms rigorously to the guidelines of the American Petroleum Institute (API) 670 standard for Machinery Protection Systems. This alignment ensures the system provides the required reliability, accuracy, and standardized response times mandatory in global oil and gas operations.
  • Functional Safety & SIL-2 Environment Support:When deployed within a fully qualified Bently Nevada 3500 monitoring loop, the probe system supports safety-instrumented functions up to SIL-2 (Safety Integrity Level 2) compliance under IEC 61508 / IEC 61511 standards. This allows safety engineers to integrate the displacement data directly into emergency shutdown (ESD) matrixes.
  • Standard Industrial-Grade Mechanical Compliance:This particular configuration suffix (-00) designates a standard industrial-grade unit without explosive-atmosphere certifications (like ATEX/IECEx). However, it maintains the same robust mechanical and electrical building blocks as certified versions, ensuring rigorous adherence to standard industrial electrical safety rules.
  • Extreme Thermal & Environmental Protection Compliance:The probe conforms to high-grade industrial sealing standards, leveraging a dual front-and-rear hermetic seal paired with an armored FluidLoc cable. This mechanical design ensures compliance with IP68-equivalent requirements, protecting the internal circuitry from fluid ingress even under continuous exposure to high-pressure steam and hot oils.
Description
The Bently Nevada 330876-02-50-01-00 represents the pinnacle of long-range eddy current transducer technology, offering the longest linear range within the benchmark 3300 XL series. It is specifically engineered to measure Differential Expansion (DE) or Rotor Expansion (RX) in massive steam turbine generators, where massive axial thermal growth must be tracked with absolute precision to prevent rotating parts from colliding with stationary components.

Featuring an advanced mechanical design, the Bently Nevada 330876-02-50-01-00 incorporates a Polyphenylene Sulfide (PPS) probe tip and an AISI 304 stainless steel case, bonded by a patented dual-seal system. This front-and-rear sealing mechanism, combined with a specialized high-temperature FluidLoc cable, forms an impenetrable barrier against high-pressure steam, moisture, and synthetic lubricants, ensuring zero-signal degradation over decades of service.

The physical architecture of the Bently Nevada 330876-02-50-01-00 includes a 5.0-meter integral cable wrapped in robust stainless steel armor with a protective PFA jacket, mitigating the risk of mechanical abrasion or cutting during installation. Equipped with gold-plated ClickLoc connectors and a unique removable collar, this specific probe configuration allows field technicians to easily route the cable through tight conduits and narrow machine casings without damaging the delicate termination points.
Alternative Names
330876 02 50 01 00 33O876-O2-5O-O1-OO 330876-02-50-0I-00 33O876-O2-5O-OI-OO 330876-02-50-01-05 330876-02-50-01-CN 330876-02-50-01-RU 330876-02-50-01-BR
Technical notes
The Bently Nevada 330876-02-50-01-00 is factory-calibrated exclusively for standard AISI 4140 target materials, meaning any deployment on alternative rotor alloys requires custom calibration curves to maintain its nominal scale factor. Additionally, the Bently Nevada 330876-02-50-01-00 is a dedicated 5-meter system component that must be paired directly with a matching 5-meter 3300 XL Proximitor Sensor (such as the 330850 series) without the use of an intermediate extension cable.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What are the exact system matching requirements for the Bently Nevada 330876-02-50-01-00 proximity probe to avoid calibration errors?
The Bently Nevada 330876-02-50-01-00 is an integrated 5.0-meter probe system. Because eddy current systems are strictly tuned by electrical length, the Bently Nevada 330876-02-50-01-00 must be connected directly into a 5-meter 3300 XL 50 mm Proximitor Sensor (such as part number 330850) without an intermediate extension cable. Interfacing this 5-meter probe with a 9-meter proximitor or adding an extra 4-meter extension cable will alter the system's impedance, completely destabilizing the nominal 394 mV/mm scale factor and causing massive measurement errors.
How does the Bently Nevada 330876-02-50-01-00 handle non-standard shaft or rotor target materials during Integration?
The Bently Nevada 330876-02-50-01-00 is factory-calibrated for high-magnetic-permeability AISI 4140 steel. If the target rotor or collar is made of a different alloy (e.g., stainless steel, Inconel, or specialized monel), the cross-talk and eddy current dissipation behavior will change. When integrating the Bently Nevada 330876-02-50-01-00 with non-4140 targets, engineers must perform a manual multi-point verification using a micrometer calfram and manually program custom linear scale factors or lookup tables into the connected machinery protection monitor (such as the Bently Nevada 3500/45 system).
What diagnostic capabilities are provided when wiring the Bently Nevada 330876-02-50-01-00 into a 3500-series monitoring system?
When the Bently Nevada 330876-02-50-01-00 is wired through its compatible Proximitor into a Bently Nevada 3500/45 Position Monitor, it unlocks deep circuit diagnostics. The system constantly monitors the DC bias voltage; if the cable is cut, shorted, or if the probe tip suffers a catastrophic impact, the monitor detects that the voltage has breached the Not OK limits (typically outside the -2V to -18V range). This instantly triggers a "Not OK" status on the rack, inhibiting false alarms or accidental machine trips while isolating the hardware fault for rapid troubleshooting.
What are the strict physical installation clearance guidelines for the Bently Nevada 330876-02-50-01-00 to prevent signal cross-talk?
Due to the large 50 mm tip diameter, the Bently Nevada 330876-02-50-01-00 emits a wide electromagnetic field. To prevent parasitic interference (cross-talk), the probe must have a minimum unobstructed side clearance of 152 mm (6.0 inches) from any adjacent structural metals or housing walls. If two Bently Nevada 330876-02-50-01-00 probes are mounted adjacent to one another for redundant cross-checking, they must be spaced at least 200 mm apart to prevent their RF fields from overlapping and corrupting the displacement signal.

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